Fastener bag

Abstract

There is provided a fastener bag capable of improving working efficiency for the filling of inner content and forming a bag cut-starting portion. The bag is formed as gusset-type packaging bag, to which a fastener for freely opening or closing the packaging bag is attached. The fastener has a male portion to which a projected thread is formed and a female portion to which a groove is formed so as to be engaged with the projected thread. Base portions of the male and female portions are attached to an inner surface of one of the flat surface portions or side surface portions so that the projected thread and the groove face each other. A cut-tape for separating the flat surface portion into the male portion side and the female portion side is provided between the base portions.

Description

[0001]The present application is based on International Application PCT / JP2003 / 003152, filed Mar. 17, 2003, which application is incorporated herein by reference in its entirety.FIELD OF THE INVENTION[0002]The present invention relates to a fastener bag of gusset-type structure which can be easily opened and is provided with a fastener to be freely opened or closed.BACKGROUND ART[0003]In these days, there is high requirement of producing a packaging bag provided with an easily opening mechanism and a mechanism for freely opening and closing an opening of the opened packaging bag. Specifically, it is required to provide a fastener bag having both functions in a technical field of an automatic filling and packaging bag capable of simultaneously filling a content in the bag and packing the bag.[0004]The applicant of the subject application has provided, in order to satisfy the above requirement, an invention relating to a flat-bag-type fastener bag which is formed with a cut-open porti...

AI Technical Summary

Benefits of technology

[0012]According to the present invention mentioned above, the fastener bag can be extremely easily opened by merely pulling the cut-tape with fingers. In addition, in an occasion that inner content filling the faster bag is gradually consumed, the opening portion of the fastener bag can be freely opened and closed, so that the opening portion of the fastener bag, which has once been opened, can be again closed, thus preventing the inner content from being oxidized or like.

[0013]On the other hand, when the inner content fills the fastener bag, after a hopper or like is inserted into the upper opening of the bag, the inner content fills, before fusing the upper portion of the fastener bag. According to the fastener bag of the present invention, since the gusset-type packaging bag is employed, the upper opening can be opened widely, thus improving the content filling efficiency.

[0014]Moreover, in the fastener bag mentioned above, a pair of the flat surface portions and a pair of the side surface portions constitute a tubular bag body having both ends opened as end openings, one of the end openings of the bag body is closed by a bottom surface portion, and the bottom surface portion provides a flat shape. According to this example, by making flat the bottom surface of the bag, there can be provided a fastener bag having high self-standing performance.

[0019]As mentioned above, by forming the boundary portion between the fused portion and the non-fused portion so as to surround the tab portion, it becomes possible to prevent the communication between the inside and the outside of the bag at the tab portion forming portion. In addition, the tab portion is itself not fused, it can be easily thumbed.

Problems solved by technology

However, in the case of this flat-bag-type fastener bag, a portion from which a content filling hopper is inserted into a bag body is not widened so much, and this matter constitutes an obstacle for improvement of working efficiency.

In addition, there may cause a case such that a cutting-starting portion of the cut-open portion, from which the bag is torn and opened, is not well formed.

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